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在重载列车运行条件下，既有线膨胀土路基易产生路基开裂、下沉和滑移的问题，影响铁路运行安全。本文通过动三轴试验，探究应力幅值、振动频率及饱和度对弱膨胀软土动力变形特性的影响，分析了滞回曲线、动回弹模量、阻尼比的变化规律。结果表明：应力幅值的增大会导致弱膨胀软土滞回曲线面积的增大，且滞回曲线的不对称性也随着加载次数的增多而增大。随着荷载频率的增大，弱膨胀软土的动弹性模量随之增加，但对阻尼比影响相对较小。饱和度的增加加快了弱膨胀软土的能量耗散，进而导致土体的动弹性模量的降低及阻尼比的升高。
Abstract：Under the combined action of heavy loads and adverse expansive soils, existing railway subgrades built on expansive soil were highly prone to cracking, settlement, and sliding, which severely compromised operational safety. This paper investigated the effects of different stress amplitudes, vibration frequencies, and degrees of saturation on the dynamic deformation characteristics of weakly expansive soft soil through dynamic triaxial tests. The evolution patterns of hysteresis loops, dynamic resilient modulus, and damping ratio were analyzed. The results indicate that an increase in stress amplitude leads to a larger area of the hysteresis loops for weakly expansive soft soil, and the asymmetry of these loops increases with the number of loading cycles. As the load frequency increases, the dynamic resilient modulus of the soil also increases, while its effect on the damping ratio is relatively minor. An increase in the degree of saturation accelerates energy dissipation in the soil, consequently resulting in a decrease in the dynamic resilient modulus and an increase in the damping ratio.
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基本信息:
中图分类号:U213.1
引用信息:
[1]颜志雄,秦涛,汤舒柳,等.重载列车提速下饱和度对弱膨胀软土路基动力变形特性的影响[J].铁道建筑,2026,66(05):43-49.
基金信息:
中国国家铁路集团有限公司科技研究开发计划（N2023G008）
2026-05-20
2026-05-20